There's actually several reasons for this. Babies don't have any concept of "self", which means that they have no idea of what is relevant to them, or what is happening to other people. They have underdeveloped brains that aren't yet recording, and you didn't yet have the language skills to "frame" what was happening to you, so you were unable to "memorise" anything in a way that would make sense to your adult self.

This includes one of your top 10 faves – the Brontosaurus. The problem was, a lot of baby dinosaurs didn't look an awful lot like their parents, so got classified as separate species. Also, Victorian explorers weren't above faking exotic dinosaur finds for fame and glory.

15.If you put your finger in your ear and scratch, it sounds just like Pac-Man.

...because tears can't fall from your face, as demonstrated by former ISS Commander Chris Hadfield. Thanks to the zero gravity on spaceships, they kind of just stick to your face in a really annoying blob. If that's not reason enough to cheer up, we don't know what is.